/**
 * Parse interval strings (e.g. "500ms", "30s", "3m", "1h") to seconds.
 */
/**
 * Parse an interval string to seconds.
 * Supports: Nms, Ns, Nm, Nh (e.g. "500ms" → 0.5, "30s" → 30, "3m" → 180, "1h" → 3600).
 * Returns the value in seconds (fractional for ms).
 * @throws if the string does not match the expected format
 */
export declare function parseInterval(s: string): number;
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